Check Delaware's corporate registry to ascertain the creditor's status. If it's still in existence, go after it.
I'm not an expert in Delaware corporate law. But generally, when a company is dissolved, the owner or directors are required to file a statement to the effect that all its debts and liabilities were discharged. If the owner in this case filed a false statement, the dissolution may be invalid or the owner may be personally liable.
Often there is a limitations period requiring you to sue within a certain time after dissolution. You should move quickly to ensure you're not barred by the expiry of the limitation period.